I am a wrestling fan especially WWF now WWE.

Why is it that the Undertaker has been unable to defeat Brock Lesnar? Lesnar ended the Undertaker's streak at Wrestlemania last year making him the first and only wrestler to have defeated the Undertaker at wrestlemania.

I just watched summer slam last week and here again, the Undertaker just was not able to contain Brock Lesnar.

What are your thoughts guys? I see the Undertaker as the greatest wrestler of all times but is Brock Lesnar his nemesis?